on high horse
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on (one's) high horse
Having an attitude of condescending moral superiority. My sister was a troublemaker as a teenager, yet she's always on her high horse lecturing me about my life choices. The radio host is known for climbing on his high horse when talking to listeners and guests about the importance of family values.
on one's high horse
Fig. in a haughty manner or mood. Larry is on his high horse again, bossing people around. The boss is on her high horse about the cost of office supplies.